Dynamics of the young LMC cluster NGC 1866

Details Dynamics of the young LMC cluster NGC 1866 Dynamics of the young LMC cluster NGC 1866

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..857f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, March 1992, p. 857-870.

Astronomy and Astrophysics

Astronomy

41

Charge Coupled Devices, Globular Clusters, Magellanic Clouds, Radial Velocity, Supergiant Stars, Astronomical Photometry, Milky Way Galaxy, Stellar Mass, Stellar Motions

Scientific paper

The 1.0-m telescope at Las Campanas was used to obtain V-band CCD images of the young LMC cluster NGC 1866 out to a projected radius of 100 pc. Radial velocities with a mean precision of 1.0 km/s were measured for 69 member supergiants using the echelle spectrograph on the 2.5-m telescope. The total cluster luminosity is 6.5 +/-0.3 x 10 exp 5 solar luminosities. A star-subtracted, median-filtered U frame was employed to determine photometric shape parameters. The stellar radial velocities indicate that NGC 1866 has a systemic velocity of 301.2 +/-1.0 km/s. A comparison of the derived values for NGC 1866 and the theoretical nu-0/sigma-0 - epsilon relationship indicates that the observed flattening is consistent with rotation. The quality of the fits for models with rotation is clearly superior to those without, and isotropic orbits agree best with the data in both cases.

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